Hi, I have a device with a standalone 328. Previously, I have used this for data gathering. I wrote a sketch which took readings from sensors on A/D inputs A0 to A5. Then I tried a different circuit: to measure the voltage of a battery connected to A0. The battery is 4 NiCads. Nominally this is 4V8, but, when freshly charged, the battery is nearer 5V6. I did try to 'drop' 1/2 volt using a diode, but made a hash of it and I think I may have tempororily connected 5V6 to pin A0. Anyway, I have tried many times to upload a new sketch to this 328, but the existing sketch refuses to budge ( although it still works OK ). The IDE reports a successful upload each time, but the new sketch doesnt load in reality. Is this odd behaviour what one might expect if the chip has been damaged. And would 5V6 on A0 be expected to wreck the chip?